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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228aee0ff5ec1b5b002731adc9bc007837f8316ec51f17e36aef85ff9cb68cfd' 
  AND token = 'QvrN2c7MVgST/HjMlqaZnrXWTv4X2ns4F6onpeVK3gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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