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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae97be3f4fc365fbf479e446f5a1ef62f3eca11625586ba2139fd8c20fa8e966' 
  AND token = 'dyJ4c3kFgVk75+3r/Sn58jSA2CQqtt+DGHjC8+OMLbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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