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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09741c955c4c1db78dd89a1dc63047fc8a82547f256b9636a2c2bc0a99a3c02' 
  AND token = '0dhDj1EttHzxGBXHJc/5Y137PyrSAKEq/BAa4jVxdDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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