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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bd62cd9aa6ebc1ac88570d54ecb7899d073ab9e594d5d357f123971025f8d9' 
  AND token = '13abQi/G5NhJ0WOqz7CP1PI0HriTKCkT7aTUcPj7q0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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