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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4020035555766de7a56d69c9e1bba27bdea6b013547aa872c87075a05acaa5' 
  AND token = 'FI5ifwl3+EV4WVV7el1Hfahbx4lNMHbeGAPcxKnI35w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}