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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5daa5ef41ac61ded2fe9d3939a17913a007f0f8cfb3d793e123c16894d896d' 
  AND token = 'dgtj+RCYuBkKX33K/WRmvEtwPLhsW3jkZMbeK17Utxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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