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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1beff9ccda3a3381ddbce930934a50292a9018a5f495bf3862aa47140d54ff' 
  AND token = 'F6WLCZqfO6at6Zx9qDz71kEqyc5p80S/qhJKVwCm79w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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