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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b970654e6b690a920b343e230df8245b61bc4755ca75ac66fb6df04b0ca340' 
  AND token = 'olaxHI5upYeNnEsvbOK3KRP/Dp1tdqEe41/n+kTeI/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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