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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a5d1e52e2dfb164c481d3e21bbaedea116b38670f30865f9d286d5ebf1249a' 
  AND token = 'avmNxfdqNxaBB+gD1YKXrTQMU7GwkzgFe5U/z1YT6cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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