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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af5b6417f7053324fc624686734dc9f3080fae9f273b55df84ae473bccb7ce7' 
  AND token = 'oTKdbGrYxQ3dcDiiKs/jn931N9iDqpx4NDrWWGGF+0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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