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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73af7ff26bce99e8718be064d14639e4dba49cc22f43248f1b0a56e87876fd4a' 
  AND token = 'oFTFzM8cTHmipxiOqE1P8JWGWpxp62Tx3osQvTen/wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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