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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b657de9ed851e2bef5b8e75014f9b7f581200a36bc34214de747f97fef5e38' 
  AND token = 'nn/BkVd4VOYu3z0Cpgz1QsTcxq6CHVAaqscspmIRJ98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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