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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dca21484fa4dc3679475fea4e8057409bc791df5c16ae6ea070a9fd7af7eb12' 
  AND token = 'HAGnGFXN9P0H5++u0GSevU38xI1hmf4LI3upVOxaUIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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