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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6706d45d606647a27a740672de00c72d1932aefab3a577ad9f5b20d019af92' 
  AND token = '3ppsPQpgt92g2PAofWr9CcJX/1ur+9QqmJBiErypy9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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