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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1c920b6fc3fbc8ee1885f01a2b54a07691073d874b5b9d5165706d060c9744' 
  AND token = 'inZICAF3BLbb5JgLwM+6PiEkiNVmTVSjCxiIi0229ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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