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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c54b47088e0ea5a052ac57c7c39aab64ec94c4666fa930b30c8dc59e7b7d213' 
  AND token = 'eiOmDThJhVb3b9Tj+JNPNp9JIp+TXUxNX/eM62BnCLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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