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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a547562e93f496026af1b1c9a2e2f75e509683ec53dac72dd658d2980505ba11' 
  AND token = 'CUUyZmcOZThgaJ+Ixo9KkJU9HID919SUzcMYejC5j7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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