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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5c7d34cbe692dac15ed1f5fbe31975eefbc6de0e69d34fe3d24e7786c47a8c' 
  AND token = 'kIVq+BAnaXRhfA3VRA540o69mYRYox7kH3RNDytCI8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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