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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3374845a70b32828ca5781713bb1c78271172bb2c37d82beb464ca12c40e45c7' 
  AND token = 'wgmA1VJzvle9rzZUh8qz55fVuqX8L7OAVtWMY5zUQVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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