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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abda7db92e73de581cb62e46c525dad5ec8bdace4e2c7b1034b6e112a901eb02' 
  AND token = '41Qn7H4MTcBaZ5hFim0dHlWVwIqd19K8bwtmPROMbFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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