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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b310a25143a6f61700fa8ccfcc1499621a48a92fa515288da6582180a91b8518' 
  AND token = 'pn6NsJpU7psj/2J1sm/U7QIq19eswVeqVsbcBlbU9Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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