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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14e69651c8b7079c7ccacb36193fbd707f6270cb786aac0fb0615e7d5dfa661' 
  AND token = 'BMj7b27GpFclL3Yg0vY2nrkd8LqZW95s/Ee2SLYXuwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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