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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05fef419616803fc4ed9a4c4c6ee4ab5bd1425f4dd5d63858a30b78dd2ce5e0c' 
  AND token = 'rSPkSfcE3H40BlC7wHVpbEj0Kh/XJnQoYkIKRqpSZMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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