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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9a17a006793b6b0c02cf417851e2cfaf2e106c39adb8bd3c9a08bfa7f08578' 
  AND token = 'AYS5T4WAvb9b4ebKTIaxlIAiuAw/VJQDZFdTM3z9blg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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