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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '545d467097d3ab070173b40bb8b178c2daba94aa7195f1ab908943d3cbb78fd4' 
  AND token = 'q9kyN75brcmT9H4iLGEXji2C31/aO302uRs4hAFFm5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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