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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893ed15bcf822021269d40f4bad3cbd7ac48fdcb25f7c4e8840db6767eeefd7d' 
  AND token = 'rG1bBf6PFLo4d9esowgsYtV2fMpPQwpw80D7hJaya74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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