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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73877a62cbd9d906a5e9f81f7a60b8f6ee360428e5806f6365ced9fcefabd82c' 
  AND token = 'aj6r0ZvB42Ke2k1tIEHo4J2p+vBWPwq0xIZh9ZKFNTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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