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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a692b0c3929720f7bd7deec56d9eef208d139c1c375723fbb087ff0bb16102ed' 
  AND token = 'zwEZsZdfKaQ1b2c6gcu+c69M1o2FBnlWK0abWMp7b6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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