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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a49cad122ce3d4f07b31363d14cd294323c95d4f77a1b775915a90c7501380c7' 
  AND token = '0WQmvtjH9Bor3RgJEI7irmWBsxRgM7t9o/6tkjVVRlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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