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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e5ad13dc223a560ef50ef2bec57a156fb82d8cf1d90eb81a64fb6b7d7cc3bc' 
  AND token = 'VlG0Z/EjgBCzddzCRZ7IHF4rkK0H4LcAMJ9r0DiipWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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