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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a7733f1b7e9dbb30a64deb462b5f3bff5ff449ad4f703643c8cf7036615b3e' 
  AND token = 'gXWT0V5NU1qwl91t8kx0zk6FaRNrZwIG+5w0WzyzKas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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