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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3da4b1ec1e85c92dbcf52fbf82bbd16f6f36dbae779cb4265e079804451639c' 
  AND token = 'oo5xaKmMDbIzro3V797LBaTm8ihRpXp1DYWE0D2hduw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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