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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882c51f393638e75569ce2f2f919b5bfdaaabab0e9631ac38e1b3115f9fd9759' 
  AND token = 'M3WBkiC1TIS6VDXDN86YjdmMK9IifPB6TqYoriODYYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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