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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c7bb2ca7b89f160cd219f6e58454d1e1d2c2f70a4246ca05b416841931f2d6' 
  AND token = '5KljJGeyn0QU0q/P+4d6+ydE29erJQpgzRjZrierbZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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