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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d1767f70fb7b8e62408d55c42d0b0e293891b2db03d678721eb1a364ca48f7' 
  AND token = 'AF5bepiANbP6WxL4IrLwDe01FGKX29qQ6j6upYbMdy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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