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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a49a1d005a990304e3cb5f9b623c4cc5a0fc855b01b990b44535ee50a71e15' 
  AND token = 'Bg2WxaZ8IzmIHA+Ce8p4AIKoGczp72ogWXFLPt/slhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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