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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11155fce8c560d60f26e738760c6c7cfeb9d5cd87bc3b3100e41e9ad6b792f7' 
  AND token = 'J0MKC8v/AJajkYTcwMIwN0covs6joiHpUCRdKM+/UjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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