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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc17e705e6842a7453fcd8ad66a6015ed668a4737e9708ed059e943de2917b45' 
  AND token = 'GayP5dPkyWN8m63Km+THBo6BAejcqSvFKHasgFim+WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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