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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0228bfb47d644f8eba0a1414c8546fe9540e4300dd07a8944fb69491d37aae70' 
  AND token = 'uQOVI6MLdbvy0+h+qv6qxc5g69QfKMgawr5RcxDLZ70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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