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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1749385c65eaf088a468321c2041e07750a1b8bba9a266de597c8474ceb5aa35' 
  AND token = 'EPXoj4O+gpcUe9cAdKDaMlq8Lgv0EuYhK6E5/qG1eos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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