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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2809f2b0f029d7e1638c8fe198cae8eed29e9f664817a9c2faacd5195fa7f56e' 
  AND token = '48J0TK+hVRyqvE4aWtnRhyWiUCrdHRAm1wRXm3WIw6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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