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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432aa32118d970bf2f11ed7fe1d43d6b17c7537a78b7d6d741a071211862b521' 
  AND token = 'EI34/coMgc/78B6G/vqd4APg6KPsDx88h2i+YXQ2NHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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