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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3afc8c53aba5f65c77e1a7af6443f680827f4a3c55a0454caa0f82a180867f46' 
  AND token = 'g7TqR2OeBdDyKQliXWNRVUNOSTlxxdMyco1ONvgKhM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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