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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4202b149491cfdf9b01bea67e23a61bc64f3bb353439d117431c62c35048206e' 
  AND token = '5EbAKO7Ncp+KfKDmzLZ0jEWAVVnvwjGqAOiacnN1l5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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