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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d0eba48708c8c4c335b6cc9ab782c002cfe355b49e020ff9ed76e36e50ddc4' 
  AND token = 'vuif2g8zNNgGLap4fiHx+e+YYdQICyAeUjfqyGx5Xe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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