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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a94c91f385e131c2ffed4e6c6a53e6c88fd7c49935311930bd843f1e8cef1f5' 
  AND token = 'D8HVV1rjNHHfsZvPPBYVIygT8XfGhxt6wvgyDxiblX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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