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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0011f2608a6ac0ea2b03d24b8a402a27a95f1849f1ead9e758be11ae7714860' 
  AND token = 'nJub5xeY64PGeWyTyJsJXe/M1aQsRZvlZQGh7cwFOOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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