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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7babb664b53d5b96ce7c14c8a3a89a85bbfec2d6c728aa6d4d6e193e60fca10' 
  AND token = 'HnF6P1k1LDrGEGSzaTP7pVOW5wXGYrEAyiAY/qIp0Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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