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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67554802006f46c00fd1095c0a3aad874a794fb0166f2bb754b3a1f43ef71e6c' 
  AND token = 'Z6xyLcY4G/4jTy3JgUONPUj48S3S2rCyo/NUbbbnoG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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