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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0bc6321b0af03be3e184b20f335cbb45b9a888fdbdc7f6a363f00287a5ca1c6' 
  AND token = 'plyquy1CBKvmDEXhGV1exlVdNT2hAaL0bJbVCOVnODM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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