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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba22d499114d2c842b8ebb00bf50ae59de3d6b0ead481899808f58165fc90ec1' 
  AND token = '/NnHl2gJpGBPIN85rThXYzqfrUztsCTxTFPwlESA40s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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