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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a133b4e4331db59d7de50ad85819691f8152c2546c34b523f9b0bc89583933b' 
  AND token = 'W4XNXI8MyMrLTjfT6v7v6H/HG7XXtW59xn4i0CjjEv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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