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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77d565b30e9b7869d66d4491c6ac011c8f445c2b3d13748e3eb5900fcf4cd05' 
  AND token = 'RYztTA1PKR3m7Vm8usgyYCe4j0DIULlduNpzmTCSDhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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