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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b4a0e39054397cba31f47c92da923ad433b70553f5f90ba5cd931fcaf12bec0' 
  AND token = 'us5s3uUBPRrSfZQqP/BEcdyDmHlwz8tVzBfC769DuoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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