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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd50c045ad6eb61fe187b84d45b8824a0e9925230716166af1fc5e6e3a1e7ba74' 
  AND token = 'nda1eBADZEEuqgc924v/o1wot79JCI4xOOxjaylibi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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