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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd634a0df2dc9d60d387976f2d7f6ff8e2701a452b98fe8182f2d44d674aeecb2' 
  AND token = 'Fky6PA7ilZ87hch7nRXx57G6ycs3mgFFIp1JtsUfl0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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